Since that time, QFTCS has reached a rather mature stage of development; having been accepted as a reasonable effective theory, valid wherever the effects of gravity are not too strong; or more importantly, as a necessary step intermediate to a full theory of interacting matter and gravity. Because of this, it is not uncommon to look upon QFTCS as a harbinger of a quantum gravity yet to come — that is, any such theory must, in some way or another, touch upon QFTCS and its quintessential information-based features.A prominent example of this is, of course, the development of the holographic principle [1]}[2]} and correspondingly, the ADS/CFT correspondence [3]}. This makes QFTCS a worthy topic for foundational study and reconstruction.
